Issue with asset attributes (and also editor state) being reset

Help & Support
1

Hi,

We are having repeated issues with attributes that reference assets being reset to ‘empty’. For example we added the following attributes yesterday:

UiStyle.attributes.add('levelSelect'        , { type: 'asset', title: 'Level Select'           });
UiStyle.attributes.add('levelSelectHover'   , { type: 'asset', title: 'Level Select - Hover'   });
UiStyle.attributes.add('levelSelectPressed' , { type: 'asset', title: 'Level Select - Pressed' });

It was working fine, and first thing this morning when we started working on the project we were met with this error:

common-ui.js:307 Uncaught TypeError: Cannot read property 'getFileUrl' of null
    at script.UiStyle.injectPauseStyle (common-ui.js:307)

Inspecting the entity in the editor revealed that this was again one of the instances where the values were reset:

302×503 40.6 KB

There is another case where the one script is still showing attributes that we removed ages ago, this is a screenshot from this morning:

After hitting the parse button the script correctly updates (we removed all attributes - and as a rule no longer use attributes on this script):